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I have consulted the following books and websites to find the words for World Words, in addition to many friends around the world! I always tried to find multiple sources to double check the meaning, spelling, etc., but please let me know at mothertongues(at)mothertongues(dot)com if you find an error or something I can add! New words are always welcome and will be added in an update. If you know the pronunciation of a word in World Words that isn't yet pronounced in the app, please add the pronunciation at www.Forvo.com and I will be able to add it in the app. Thank you/Dankie/Gracias/Obrigado!

In Other Words: A Language Lover's Guide to the Most Intriguing Words around the World, by C. J. Moore

They Have a Word for It: A Lighthearted Lexicon of Untranslatable Words & Phrases, by Howard Rheingold

The Meaning of Tingo: and Other Extraordinary Words from Around the World, by Adam Jacot de Boinod

That's Amore!: The Language of Love for Lovers of Language, by Erin McKean